from the official htc support page...
Processor Qualcomm® QSD8255, 1GHz Snapdragon
Operating System Shipped: AndroidTM 2.2 (Froyo)
Current: AndroidTM 2.3.3 (Gingerbread)
ROM version: 2.47.502.7
Internal Memory 768MB/RAM 4GB/ROM
Notice the Current ROM version.
a link for those that doubt,
http://www.htc.com/us/support/inspire-att/tech-specs/
also...
Starting August 4th 2011, HTC will be rolling out a system update for the HTC Inspire 4G.
This update will only be available for AT&T HTC Inspire 4G Customers and will be sent to the device over the air. Once the release is ready, HTC Inspire 4G users will receive a notification on their device advising them of this update and provide instructions to receive and install it. Users can proactively check for this update by going to Home>Menu>Settings> AT&T Software Update > HTC Wi-Fi software update > Check now. The system update can also be downloaded below and manually applied to the device. less
This system update includes:
Android 2.3.3 Gingerbread
New HTC Sense™ features
Updated Application Tray features
Updated FriendStream™ features
Added Quick Settings in the Notifications window
Improved Power Management function
Improved media experience
Various minor bug fixes
Manual system update instructions:
NOTE: Performing the system update manually will delete all information from the device. Ensure all information is backed up before proceeding. Information saved on the microSD card will not be affected.
from
http://forums.att.com/t5/HTC/Inspire-GB-update-when/td-p/2821307